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E46 (1999 - 2006) The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

Ok, my battery is completely dead. I noticed that there is something that continues to blow in my cabin when I shut the car off. I don't know what the hell is it. I know for a fact that my A/C was disconnected..but why is something blowing, and what is it?

Ok, my battery is completely dead. I noticed that there is something that continues to blow in my cabin

It happens to everyone at some point.

- What is the canonical thread on the BMW FSU/FSR/Blower Motor Resistor (1) and what is the right brand FSR to purchase (1) (2) when your interior heating & air conditioning HVAC/IHKA blower motor goes haywire (1) (2) (3) (4) (5) (6) (7) (8) & how to test the FSU (1) (2) (3) & how to repair your own final stage resistor including an autopsy & wiring diagram schematic (1) (2) and why a bad final stage unit will cause the battery to drain overnight (1) (2) (3) & how to isolate and replace the blower motor (1) (2) (3) (4) (5) (6) & how not to replace the FSU (1)

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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need